When you ask "What number is halfway between 51 and 660?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=51 and Y=660.
To find the number halfway between 51 and 660, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 660 into our formula, we get:
(51 + 660)/2 = 355.5
Thus, the number halfway between 51 and 660 is 355.5.
To check that our answer is correct, we subtract 51 from 355.5 and subtract 355.5 from 660 and compare the two numbers:
355.5 - 51 = 304.5
660 - 355.5 = 304.5
As you can see, the halfway number is 304.5 higher than 51 and 304.5 lower than 660. Therefore, our halfway between answer of 355.5 above is correct.
Halfway Between
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